| 0 | Ongais / Field | Interscope Racing (USA) | Ted Field | Porsche | 935 | /77A | Porsche | Gr.5 | Div.2 |
| 08 | Haywood / Paul | JLP Racing (USA) | | Porsche | 935 | /77A | Porsche | Gr.5 | TA-II/Div.2 |
| 1 | Follmer / Ickx | Vasek Polak Racing (USA) | Vasek Polak | Porsche | 935 | | Porsche | Gr.5 | Div.2 |
| 2 | Hobbs / *Peterson | McLaren North America (USA) | | BMW | 320 | i Turbo | BMW | Gr.5 | Div.2 |
| 3 | Guthrie / Redman / Haywood / *Follmer | Vasek Polak Racing (USA) | Vasek Polak | Porsche | 935 | | Porsche | Gr.5 | TA-II/Div.2 |
| 4 | Haywood / Gunn / *Ickx / *Guthrie / *Follmer | Vasek Polak Racing (USA) | Vasek Polak | Porsche | 935 | | Porsche | Gr.5 | TA-II/Div.2 |
| 6 | Pickett / Gloy | Pickett Racing (USA) | Greg Pickett | Chevrolet | Corvette | C3 | Chevrolet | - | TA-II |
| 7 | Heimrath / Miller | Heimrath Racing (CDN) | Ludwig Heimrath | Porsche | 935 | | Porsche | Gr.5 | TA-II/Div.2 |
| 9 | Huber / Headley | Apple Valley Racing (USA) | | Chevrolet | Corvette | C3 | Chevrolet | - | TA-I |
| 10 | Stuck / Quester | BMW Faltz Essen (D) | Rüdiger Faltz | BMW | 320 | | BMW | Gr.5 | Div.1 |
| 11 | Heinz / Forbes-Robinson / *McClain | Budweiser Racing Team (USA) | | Chevrolet | Monza | | Chevrolet | - | TA-II |
| 12 | Peterson / *Hobbs | McLaren North America (USA) | | BMW | 320 | i Turbo | BMW | Gr.5 | Div.2 |
| 13 | Shaw, Jr. / Shelton | Hal Shaw Racing (USA) | Hal Shaw | Porsche | 935 | | Porsche | Gr.5 | TA-II/Div.2 |
| 15 | Mancuso / Coykendall | Motion Marketing (USA) | | Chevrolet | Corvette | | Chevrolet | - | TA-I |
| 16 | Kassel / Franklin | Kassel Auto Parts of Syracuse | | Chevrolet | Camaro | | Chevrolet | - | TA-I |
| 17 | Pallavicini / Calderari | Pallvano Corse (CH) | Angelo Pallavicini | Porsche | 934 | | Porsche | GT | TA-II/Div.2 |
| 18 | Kicak / Young | Free Spirit Racing | | Chevrolet | Corvette | | Chevrolet | - | TA-I |
| 19 | Cord / Adams | Chris Cord Racing (USA) | | Chevrolet | Monza | | Chevrolet | - | TA-II |
| 20 | Höttinger / Grohs | BMW Faltz Essen | | BMW | 320 | | BMW | Gr.5 | Div.1 |
| 22 | Stephens / *Bergstrom | Jeffrey Stephens (USA) | Jeffrey Stephens | Porsche | 911 Carrera | RSR | Porsche | - | TA-II |
| 24 | Frank / Leven | Executive Industries (USA) | Tom Frank | Porsche | 911 Carrera | RSR | Porsche | - | TA-II |
| 25 | Migault / Guitteny | Grand Competition Cars, Inc. (USA) | | Ferrari | 365 GT4/BB | | Ferrari | - | TA-II |
| 29 | Overbagh / Hagan | Billy J. Hagan (USA) | | Chevrolet | Monza | | Chevrolet | GT | TA-II/Div.2 |
| 30 | Hezemans / Fitzpatrick / Gregg | GeLo Racing (D) | Georg Loos | Porsche | 935 | /77A | Porsche | Gr.5 | Div.2 |
| 32 | Griswold / Akin | Earle & Akin Racing Assoc. (USA) | Steve Earle/Bob Akin | Porsche | 911 Carrera | RSR | Porsche | Gr.5 | TA-II/Div.2 |
| 41 | Arutunoff / Marina | Automotive International (USA) | Anatoly Arutunoff | Lancia | Stratos | HF | Ferrari | - | TA-II 2.5 |
| 43 | Joyce / Bothello | Phantom Racing (USA) | | Chevrolet | Corvette | C3 | Chevrolet | - | TA-I |
| 44 | Fuerstenau / Tullius | Group 44 (USA) | Bob Tullius | Jaguar | XJS | | Jaguar | - | TA-I |
| 51 | Aquilante / White / *White / *Wolpert | Thomas Aquilante | | Chevrolet | Corvette | | Chevrolet | - | TA-I |
| 52 | Slodowick / McCandless | McCandless Automotive | | Porsche | 914 | /6 | Porsche | - | TA-I 2.5 |
| 53 | Schuler / Schuler | Fred Schuler | | Datsun | 280Z | | Datsun | - | TA-I |
| 57 | Frostrom / Wood | Robert Frostrom Racing (USA) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | - | TA-II |
| 60 | Brandt / Callas | John J. Brandt (USA) | John Brandt | Chevrolet | Corvette | C3 | Chevrolet | - | TA-I |
| 62 | Thomas / *Johnson | Lancer | | Porsche | 911 Carrera | RSR | Porsche | - | TA-II |
| 64 | Carter / Baechle | Endurance Racing Enterprises, Inc./Auto Parts | | Chevrolet | Corvette | | Chevrolet | - | TA-I |
| 69 | Fiscus / Lancaster | Old Gold Racing | | Chevrolet | Corvette | | Chevrolet | - | TA-I |
| 71 | Thomas / Chandler | Otis Chandler (USA) | | Porsche | 935 | | Porsche | Gr.5 | TA-II/Div.2 |
| 74 | Scott / *Honegger / *Weir | Z & W Enterprises (USA) | | Porsche | 911 | S | Porsche | GT | TA-I/Div.2 |
| 75 | Ridgely / Cook | Norman Ridgely (CDN) | | Porsche | 911 Carrera | RSR | Porsche | - | TA-II |
| 77 | Jennings / O'Steen | Bruce Jennings (USA) | Bruce Jennings | Porsche | 911 | S | Porsche | - | TA-I 2.5 |
| 79 | Callas / Papke | Rennsport Porsche Works (USA) | Michael Callas | Porsche | 911 Carrera | RSR 3.0 | Porsche | Gr.5 | TA-II/Div.2 |
| 80 | Engels / *Nagel | Nagel Racing Enterprises (USA) | | Chevrolet | Corvette | C3 | Chevrolet | - | TA-I |
| 81 | Morton / *Bedard | Adams Associates (USA) | Herb Adams | Pontiac | Firebird | Trans-Am | Pontiac | - | TA-II |
| 82 | Solomone / *Lang | Solomone Racing | | Chevrolet | Camaro | | Chevrolet | - | TA-II |
| 88 | Hamilton / Collins / Wade | Hamilton House Racing | | Porsche | 911 | S | Porsche | - | TA-II 2.5 |
| 90 | Stommelen / Schurti / Barbour | Dick Barbour Performance (USA) | Dick Barbour | Porsche | 935 | /77A | Porsche | Gr.5 | Div.2 |
| 91 | Roberts / Schulte | Tom's Mechanical Emporium | | Chevrolet | Corvette Sting Ray | C2 | Chevrolet | - | TA-I |
| 92 | Orr / Jobe / *Miller | E. F. Miller & Co. and Sherill ARCO | E. F. Miller | Chevrolet | Corvette | | Chevrolet | - | TA-I |
| 93 | | Whittington Borthers (USA) | | Porsche | 934 | /5 | Porsche | Gr.5 | Div.2 |
| 94 | Whittington / Whittington | Whittington Borthers (USA) | | Porsche | 935 | /77A | Porsche | Gr.5 | Div.2 |
| 97 | Frank / Schramm | Framm Promotions (USA) | | Porsche | 911 Carrera | RSR | Porsche | - | TA-II |
| 98 | Rynone / Oleyar | Rynone Industries (USA) | Tom Rynone | Chevrolet | Corvette | C3 | Chevrolet | - | TA-I |